I did try the Bowden adjustment but it had no effect on the downshift. It moved the shift point up to higher rpm's, but didn't seem to affect the downshift one bit. Looking at how the Bowden cable is rigged, in my car anyway, the Bowden cable only works when there is throttle pressure. Most of the time as I decelerate, my foot is off the pedal anyway. Maybe the earlier deisels were set up differently. Thanks for the suggestion though.

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1972 280SE 4.5
1984 300SD, 250K
1991 300SE, 89K
1992 300D (330K miles when KIA'd by mother-in-law 8/10/09 - still sitting in my barn)
1994 E320, 109K
1995 E420, 60K
Proud Member of the Mercedes Benz Club of America - Idaho Chapter

Is your turbo working correctly?
Similar problem here.
1993 300D downshift clunk

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92 300D 2.5L OM602 OBK #59

Again, thanks for the suggestion, but it's not the turbo. I have already done the turbo pressure wastegate mod and the turbo works beautifully. Also, my modulator holds vacuum so it's not the other problem referenced in the post.

I am thinking of taking it to a transmission shop with experience in odd-bad transmissions to see if they can diagnose it. Still thinking the first sjop messed something up with the internal modulation pressure when they had the valve body off and replaced the seals. That was $600 I wish I had never spent...I'd rather still have the 2-3 flare then this slamming downshift I have now.

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1972 280SE 4.5
1984 300SD, 250K
1991 300SE, 89K
1992 300D (330K miles when KIA'd by mother-in-law 8/10/09 - still sitting in my barn)
1994 E320, 109K
1995 E420, 60K
Proud Member of the Mercedes Benz Club of America - Idaho Chapter

Sorry to read that you've got $600+ into it and it's not right. Keep us updated. I've got 319K on my 92 so I've got an interest in what's happening to others.

Have you seen this:
http://pdfcast.org/pdf/mercedes-benz-technical-service-information-722-3-4-erratic-downshift

Some other reading might be of help:
http://www.scribd.com/doc/33042562/1996-Mercedes-Benz-C220DIAGNOSIS-722-SERIES-%E0%B8%8A%E0%B9%88%E0%B8%B2%E0%B8%87%E0%B8%81%E0%B8%9A

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92 300D 2.5L OM602 OBK #59

That's good stuff. Thanks. I had over 300K (almost all my miles, too) on my last '92 300D and now have gone from 240K to 257K on this one. I love these cars. Normal maintenance and most repairs are all do-it-yourself, as you probably are well aware of by now.

I'll let you know when I get it resolved. It'll be awhile since I'm on my way to spend a year in Iraq courtesy of the US Army. But when I'm back, I'll dive back into this problem. It's driving me nuts, but otherwise I love the car and would like to see this tranny problem resolved, especially since it's my around-the-town daily driver. Thanks!

__________________
1972 280SE 4.5
1984 300SD, 250K
1991 300SE, 89K
1992 300D (330K miles when KIA'd by mother-in-law 8/10/09 - still sitting in my barn)
1994 E320, 109K
1995 E420, 60K
Proud Member of the Mercedes Benz Club of America - Idaho Chapter

Ahh, good point. Sorry can't help. Never done any K1 spring stuff. I was just looking at my 93 2.5T trying to adjust the bowden cable. I'm having hard up shifts on it. Just starting my adventures with adjusting the transmissions on a 87 and 93. The 93 doesn't seem to have an adjustable bowden cable. I looked in the FSM pdf and there is no 602 mentioned. Just 603.96 and a bunch of 1XX engines. Does your bowden have an adjustment screw? Its on the right (passenger) side of engine right? If not , where is it?

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius

Actually our cars do have an adjustable Bowden cable. Look on the passenger side of the cyl head, back towards the firewall, and you'll see a bracket connected to the cyl head that has a cable running off below it down towards the tranny. Where the cable runs through the bracket, there is a small red accordian-looking rubber cover. You'll see where the cable moves a rigid slider that goes accross over the top of the valve cover and connects in with the rest of the throttle linkages on the drivers side. On the slider that goes over the valve cover there are two nuts that you can loosen and adjust the length of that linkage. Adjusting this linkage will move the upshift point up or down depending on the length of the linkage.

__________________
1972 280SE 4.5
1984 300SD, 250K
1991 300SE, 89K
1992 300D (330K miles when KIA'd by mother-in-law 8/10/09 - still sitting in my barn)
1994 E320, 109K
1995 E420, 60K
Proud Member of the Mercedes Benz Club of America - Idaho Chapter

Thanks. Wayfarer. Yep. I was looking at right thing. Guess they got rid of adjusting nut. I like my shift points. Need to adjust the VCV. Not getting vacuum from it at all. Where did you get info on adjusting the VCV.? I can't find it in the fsm.


L

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius

VCV adjustment is in the FSM. I don't have it in front of me otherwise I'd point you to the section. The FSM is definitely a little hard to navigate especially if you have one of the cheapie CD copies. . Basicly the procedure is to loosen the two mounting nuts on the VCV enough that you can pivot the VCV back and forth on the lower nut (the upper nut is for the adjustment. With the engine off, have somebody floor the accelerator as you move the VCV through its range. You will notice that the VCV will hit a definite resistance point about 2/3 the way through its adjustment range. Hold it there and tighten it down.

If you're not getting any vacuum at all out of it though, there might be something else going on. Check all the lines for leaks first.

__________________
1972 280SE 4.5
1984 300SD, 250K
1991 300SE, 89K
1992 300D (330K miles when KIA'd by mother-in-law 8/10/09 - still sitting in my barn)
1994 E320, 109K
1995 E420, 60K
Proud Member of the Mercedes Benz Club of America - Idaho Chapter

If the mechanics said the problem is in your transmission, then maybe the problem is with your transmission.

Have them fix it, and be done.

Good luck.

Lol. Stupid me. Lucky I thought to check vac to the vcv before adjusting. It was just a disconnected vac hose. Been driving around for months with clunky shift till I got a weekend to dig in and research the vac system id thought id combed for leaks before . All I needed was some new vac hose that fit tighter to keep that orifice from discinnecting by the vac pump

That thing shifts so smooth now can't even feel it. Amazing. Also turbo kicks in better. Runs like a new car. 265,000 on this one. Awesome w124s. Now my wagon, I think it might have bigger problems.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius